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MI

This forest bed is located at the bottom of Thunder Bay in ten meters of water. Larch stumps are dated ca. 7850-8020 Cal Yrs BP. The site provides evidence on shoreline position of Lake Huron during the onset of the Nipissing transgression in the northern Lake Huron Basin.

This is one of the oldest submerged forest beds reported in the Great Lakes region. The site is located in the eastern part of Straights of Mackinac, a narrow waterway connecting Lake Michigan and Lake Huron. The site was located and sampled with help of deep-water divers led by Captain Luke Clyburn. Spruce wood is dated to 10,700-11,750 Cal Yrs BP with one radiocarbon date in 1996. Possibly this site is younger and may associated with the Pre-Boreal shoreline transition.

• Early Holocene drown forest in Lake Huron • Nipissing transgression in the northern Lake Huron Basin This is one of the Early Holocene drowned forest locations clustering on the eastern edge of the Straights of Mackinac, a narrow waterway connecting Lake Michigan and Lake Huron. The site was located and sampled with help of deep-water divers led by Captain Luke Clyburn. White-cedar fast growing and young trees are dated to 8360-9765 Cal Yrs BP.

• Early Holocene submerged forest bed in Lake Huron This is one of the Mid Holocene drowned forest locations clustering near the northern Michigan shores on Lake Huron. Stumps were found at 20-25 feet of water about 30 miles north of Thunder Bay. The site was located and sampled in 2012 with the help of NOAA divers led by Captain Luke Clyburn. One 51-ring sample of red pine was dated with radiocarbon to ca. 8370-8410 Cal Yrs BP. This is the oldest submerged forest bed found in Lake Huron so far.

This is another a Mid Holocene drowned forest bed in the southern Lake Huron located a few miles offshore of Lexington Township, MI. We have only one specimen analyzed from the site sampled with the help of deep-water divers led by Captain Luke Clyburn. It was a pine stump with 98 tree rings. Most likely, this site is similar to the Mid Holocene drown forest at Sanilac site (TBDH/SFDH) located in the vicinity.

Samples collected in 1999 from a location about 1 km north of Moline, Allegan Co., MI, by Dr. Alan Kehew. They were taken from a pile of soil saved from an excavation about 8 m deep. The pile of sediment consisted of mainly gray silt containing many wood fragments and some intact spruce cones. Earlier radiocarbon dating gave ages of 12,540 ± 60 and 12,620 ±70 years.